Area Forecast Discussion
Issued by NWS Rapid City, SD

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000
FXUS63 KUNR 260440
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1040 PM MDT Wed Apr 25 2018

.DISCUSSION...(This Evening Through Wednesday)
Issued at 305 PM MDT Wed Apr 25 2018

Current surface analysis shows high pressure southeast of the
region, with a cold front moving southeast across northern and
western MT. Upper level analysis shows a shortwave ridge moving
east of the area, with a trough moving quickly southeast through
western MT. Mid and high clouds are increasing across the area
ahead of the trough. Mild air is in place ahead of the front, with
temps in the 60s and lower 70s. Winds are south to southwest
ahead of the front, breezy over parts of northeast WY and western
SD.

Upper trough and cold front to the northwest will push through the
area tonight, bringing mostly isolated showers, with gusty winds and
some cooler air into Thursday. The best chances for showers should
be across northeast WY and the Black Hills overnight, but pcpn
amounts will be very light. Highs on Thursday will be 5 to 10
degrees cooler across the area, mid 50s to mid 60s.

Friday and the weekend look to be mainly dry and pleasantly warm as
a ridge builds north across the Rockies and moves east through the
Plains. Highs each day will be in the upper 60s and 70s, with some
lower 80s possible over northeast WY on Saturday and across the SD
plains on Sunday. As ridge shifts east of the area by Monday, a low
pressure system will move across the Pacific NW and eventually into
the Northern Rockies and Plains. Southwest flow ahead of the system
will bring some chances for showers and possibly a few storms late
Sunday into Monday. As the low moves further east Monday and
Tuesday, a cold front will pass through the region and bring a
gradual cooldown to near or slightly below average temperatures for
Tuesday and Wednesday. Latest models have the upper low passing to
the north of the area and weakening, which would result in mostly
isolated shower activity into midweek.

&&

.AVIATION...(For the 06Z TAFS Through 06Z Thursday Night)
Issued At 1039 PM MDT Wed Apr 25 2018

A cold front will continue to move through the region tonight,
supporting gusty NW winds. Scattered rain showers are possible
across NE WY into the Black Hills and SW SD overnight, with the
rain possibly mixed with snow in the Black Hills. MVFR conditions
possible with the showers, especially around the Black Hills.
Conditions will improve from west to east Thursday morning.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

$$

DISCUSSION...26
AVIATION...JC



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